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You can send text messages to anyone using Terminal.
If you need access to programming tools on your Mac, there are several ways to go about installing them.
OS X supports encrypting files from the command line, if you need to do so by logging in remotely.
In addition to using the system preferences, you can adjust Wi-Fi network configuration in OS X via Terminal.
Apple provides three basic settings for Gatekeeper in OS X Mountain Lion, but you can manage this service in finer detail if needed.
In addition to the Mac App Store, you can use the Terminal to access and install available software updates.
While the use of system preferences is an easy option, this setting can be scripted for quick reversion either manually or by scheduling.
If a PNG screenshot being dropped on your desktop is less than ideal, this is the tip for you.
Disabling Java in OS X requires doing so for each user account; however, even terminal commands for doing this may be a bit impractical to use as a substitute.
It's not for everyone, but for the technically sophisticated, Google now offers command-line controls for several services.